Electrical attachment-plug.



.No. 845,543. H PATENTBD FEB. 26,1907

' e. W. GOODRIDGE.

ELECTRICAL ATTACHMENT PLUG. TAPPLIOATION FILED JAN. 7, 1907.

ATTORNEYS UNITED STATES PATENT OFFICE.

GILBERT NV. ,GOODRIDGE, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE PERKINS ELECTRIC'SWITCH MANUFACTURING COMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF CONNECTICUT.

ELECTRICAL ATTACHMENT-PLUG.

Specification of Letters Patent 3 Patented net. 26, 1907.

Application filed January 7. 1907.. Serial No- 351,220.

- ica, and residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Electrical Attachment Plugs, of

which the following is -a specification.

Myinvention consists of an improvement in the construction of the electrical attachment-plug forming the subject-of the Thomas patent, 797,472, dated August 15, 1905-; and

- the main object of my invention is to so construct the cup or head of the plug as to be able to reduce the chambers containing the contacts to the smallest possiblesize-that is to say, no larger than is necessary to re-,

ceive cylindrical contact-sockets. v

e In the accompanying drawings, Figure l is a perspective view of the attachment-plug without a cap. Fig. 2 is a vertical section of the plug with the cap alongside in external view. Fig. 3 is a section through the plug on the line 3 3, Fig. 2, but with a cap having a modified form of contacter.

- As seen 111 Figs. 2and 3, A is the cap of porcelain or other'insulating material and provided with the usual central opening for the admission of the wires, thebared ends of which are connected to the terminal plates of the connecting-pins B (B.) In Fig'. 2 I have shown these connectmg-pins as vertically split pins of common form to enter and hold by lateral friction against theinner walls of thetubular'contact-sockets.C C, carried by 'theinsulating cup-D. I form on one side of each of these sockets Q Of an o ening 4, pro-' ducing a shoulder 5, with whic l may engage a shoulder on the spring-latch. 6, which is combined with the pinIB: on the capjn the construction shown in Fig, 3. Thus these socketsC O are capable of'us'e with either the style of connecting-pin'shown in Fig. 2 or that shown in Fig. 3. Inthis construction,

as in the Thomas attachment-plug, before referred to, there is an insulating-core E below the cup and around this core the usual me tallic screw-shell F, forming the ring terminal of the Edison type, held to the underside of the cup Dby a screw H-,passingfthrjough the flange of the shell and screwed into the bottom of the socket C, which is thereby held in place in the cup. The central terminal consists of thehead of a long screw G with washer to and passing centrally up through the core E. The upper end of this screw G is threaded and screwed into a plate J in a chamber 7 on the under side of the cup D.- This plate J is bent upwardly,*as shown in Fig.2, so as to carry its outer end clear of the flange of the shell F. A screw 8, passin through an opening in the end of the plate enters the socket C and holds the latter in place in its chamber in the upper side of the cup. By thus providing the plate J on the under side of the cup D, I am enabled to reduce the size of the chambers for the sockets on the upper sideof the'cup, andsd reduce the liability to accidental short-circuit and also to give a better appearing plug when the capisofi. f

I claim as my invention 7 The hereindescribed attachment plug, comprising a cap carrying connecting-pins with a cup containing chambers on its upper side, contacts for the cap-pins mounted said chambers and carried'b'y the cup, and a chamber on the under side ofthe cup con.-

taining a plate electrically con'nected to one of the contacts on the upper side, a separate insulating-core with a ring terminal and a In testimony whereof I have signed my.

name to this specification in the presence of two subscribmg witnesses.

-Witnesses: I

' I GEORGE B. THOMAS,

E E; SEELEY.

GILBERT w. eoonsrne'n 

